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From: Robert.Patrick@cs.cmu.edu
To: postgres@postgres.Berkeley.EDU
Subject: Limit to where clause length???????
Date: Tue,  4 Oct 1994 21:10:52 -0400 (EDT)
Message-ID: <AiYToQS00hMd8UgK4N@cs.cmu.edu> (raw)

I am attempting to execute a query over several tables by stringing
together a where clause that match the correct attributes in each of
four tables.  

If I execute the following query, I get back a 10 tuples.

retrieve (models.all) where langLinks.source = models.id
	and langLinks.title = "Universal"

However, when I execute the following query, I get back an empty table.

retrieve (model.all) where (lang.Links.source = models.id 
	and langLinks.title = "Universal") or 
	(partLinks.source = models.id and partLinks.title = "Universal") or
	(userLinks.source = models.id and userLinks.title = "Universal") or
	(opLinks.source = models.id and opLinks.title = "Universal")

Why doesn't this query find the same tuples the first one finds?

Thanks,
Robert

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